<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<HTML LANG="EN">
<HEAD>
<TITLE>VT100.net: Digital VT220 Programmer Reference Manual</TITLE>
<LINK HREF="vt220-rm.css" TYPE="text/css" REL="STYLESHEET">
</HEAD>
<BODY>
<DIV CLASS="navbar"><A HREF="http://vt100.net/"><IMG CLASS="button" SRC="vt100.net-logo.png" ALT="VT100.net" HEIGHT="16" WIDTH="102"></A> VT220 Programmer Reference Manual<TABLE WIDTH="100%">
<COL SPAN="3" WIDTH="33%">
<TBODY>
<TR>
<TD ALIGN="LEFT"><A HREF="chapter4.html">Chapter 4</A></TD>
<TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD>
<TD ALIGN="RIGHT"><A HREF="appendixb.html">Appendix B</A></TD>
</TR>
</TBODY>
</TABLE>
<HR></DIV>
<P CLASS="chapterhead">Appendix A</P>
<H1 CLASS="chapterhead">VT220/VT102 Differences</H1>
<P>This appendix describes the major differences between a VT102
terminal and the VT220 terminal operating in a VT100 mode.</P>
<TABLE>
<THEAD>
<TR>
<TH ALIGN="LEFT">Difference Area</TH>
<TH ALIGN="LEFT">VT102</TH>
<TH ALIGN="LEFT">VT220</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>LED indicators</TD>
<TD>Programmable</TD>
<TD>Not Programmable</TD>
</TR>
<TR VALIGN="TOP">
<TD>Alternate character ROM</TD>
<TD>Socket for OEM-supplied character ROM</TD>
<TD>Down-line-loadable character set</TD>
</TR>
<TR VALIGN="TOP">
<TD>Screen freeze</TD>
<TD><SPAN CLASS="keyname">NO SCROLL</SPAN> key</TD>
<TD><SPAN CLASS="keyname">Hold Screen</SPAN> key</TD>
</TR>
<TR VALIGN="TOP">
<TD>Printer port connector</TD>
<TD>25-pin</TD>
<TD>9-pin</TD>
</TR>
<TR VALIGN="TOP">
<TD>Screen refresh</TD>
<TD>50/60 Hz</TD>
<TD>60 Hz only</TD>
</TR>
<TR VALIGN="TOP">
<TD>Set-up</TD>
<TD>Display in set-up "bits".</TD>
<TD>Display in three different languages. Different display. Has no effect on software.</TD>
</TR>
<TR VALIGN="TOP">
<TD>RIS function</TD>
<TD>Performs power-up self test</TD>
<TD>Does not perform power-up self test</TD>
</TR>
<TR VALIGN="TOP">
<TD>Off-Line/local mode</TD>
<TD>Off-Line mode disconnects modem.</TD>
<TD>Local mode does not disconnect modem.</TD>
</TR>
<TR VALIGN="TOP">
<TD ROWSPAN="3">Communication</TD>
<TD>Full duplex and half duplex</TD>
<TD>Full duplex only. Does not affect software.</TD>
</TR>
<TR VALIGN="TOP">
<TD>Transmit speed limit is 60 characters/second regardless of baud rate.</TD>
<TD>Optional transmit speed limit is 150 characters/second.</TD>
</TR>
<TR VALIGN="TOP">
<TD>Passive or active 20&nbsp;mA is selectable.</TD>
<TD>Only has passive 20&nbsp;mA.</TD>
</TR>
<TR VALIGN="TOP">
<TD ROWSPAN="2">Terminal ID</TD>
<TD>Responds to primary device attributes with <CODE>ESC&nbsp;[&nbsp;?&nbsp;6&nbsp;c</CODE> sequence.</TD>
<TD><P>You can select the DA response in set-up. The standard VT220 response is</P>
<PRE>CSI ? 62;1;2;6;7;8;9 c</PRE><P>sequence.</P></TD>
</TR>
<TR VALIGN="TOP">
<TD>Secondary device attribute not supported.</TD>
<TD>Responds to secondary device attribute with
<PRE>CSI &gt; 1;Pv; 0 c</PRE>
sequence.<BR>Pv is firmware version number.</TD>
</TR>
</TBODY>
</TABLE>
<DIV CLASS="navbar"><HR>
<TABLE WIDTH="100%">
<COL SPAN="3" WIDTH="33%">
<TBODY>
<TR>
<TD ALIGN="LEFT"><A HREF="chapter4.html">Chapter 4</A></TD>
<TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD>
<TD ALIGN="RIGHT"><A HREF="appendixb.html">Appendix B</A></TD>
</TR>
</TBODY>
</TABLE>
<DIV CLASS="navbot">http://vt100.net/docs/vt220-rm/appendixa.html</DIV></DIV>
</BODY>
</HTML>
